Thank you for visiting the Website for the Benton County Mosquito Control District. Since 1969 we have been providing mosquito control services. We hope that this website answers your questions and increases your knowledge of mosquitoes and mosquito control activities. If you can't find what you're looking for, please feel free to contact us.

The Benton County Mosquito Control District is dedicated to responsibly improving the quality of life and increasing public education in our area. The District accomplishes this by utilizing Integrated Pest Management (IPM) strategies. IPM is designed to utilize cost-effective control measures to reduce mosquito populations and the diseases they potentially carry, while being environmentally sensitive.

Communication and cooperation with property owners, residents and governmental agencies are critical components in the effort to reduce mosquito populations. Benton County MCD strives to be open and responsive to our community.


Abundant Mosquito Populations Along the Yakima River

Areas along the Yakima River, especially near West Richland, have been experiencing large number of mosquitoes.  These species of mosquitoes are broadly referred to as "floodwater" mosquitoes.  Female mosquitoes, days or even years prior, will place eggs into moist soil in anticipation of the water level rising.  If the water rises covering the eggs and if the water temperatures and daylight hours are sufficent, then the eggs will hatch.

With our snowpack this year (estimated at 142% of normal as of May 19th, 2017) we have had multiple events where the Yakima River has risen and fallen, giving repeated opportunities for these eggs to hatch.  Benton County Mosquito Control is using "fogging" (truck-based spraying for flying mosquitoes) to try and reduce the populations, but this is unfortunately a temporary impact; more mosquitoes are being produced along the river system and inlets that are affected by the river system.  Additonally, we cannot treat the Yakima River itself.  The products we use are designed for stagnant bodies of water, so what would happen is that the mosquito control product would be pulled downstream but the immature mosquitoes (larvae) would remain, since they can "swim" and readjust themselves to slow flow conditions.

We are trying to provide some relief and appreciate you patience in this matter.  We highly recommend that you use (if possible and appropriate) a Centers for Disease Control (CDC) approved repellent listed for mosquitoes.  You can learn more about repellents at this link; http://www.mosquitocontrol.org/repellents.

The District advises using precautions to limit exposure to mosquitoes.

  • Repellent; your best defense against bites
  • Evening & morning have higher mosquito activity
  • Pour out standing water weekly
  • Even one bite can cause illness
  • Long-sleeve shirt & pants

If you should have any quesitons or wish to inform us of areas where the mosquitoes are causing issues, please use the Contact Us icon on the left of this page.  Thank you.